Fox drew its largest overall Monday audience this summer last night, winning in all key categories behind ''Hell's Kitchen'' and ''MasterChef,'' which grew week to week. According to preliminary national estimates from Nielsen, ''Hell's Kitchen'' (2.6 rating/8 share in adults 18-49, 6.2 million viewers overall) and ''MasterChef'' (2.6/7 in 18-49, 6.3 million viewers overall) tied as Monday's top program in adults 18-49 as well as adults 18-34 (2.1 rating) and 25-54 (3.1 rating). Fox won the night in adults 18-49, winning its sixth Monday in seven tries this summer. At ABC, special ''The Bachelorette: The Men Tell All'' (2.2/6 in 18-49, 7.1 million viewers overall) was down from recent episodes of the show but up over last year's similar special. It was followed by the low-rated rookie show ''The Glass House'' (1.0/3 in 18-49, 2.8 million viewers overall). NBC saw both ''Fear Factor'' (1.5/5 in 18-49, 4.2 million viewers overall) and ''American Ninja Warrior'' (1.7/5 in 18-49, 4.5 million viewers overall) bounce back from their low levels of last week. And at 10, it aired an encore of Friday drama ''Grimm'' (0.8/2 in 18-49, 2.6 million viewers overall). CBS aired repeats of ''How I Met Your Mother'' (1.1/4 in 18-49, 4.1 million viewers overall), ''2 Broke Girls'' (1.2/4 in 18-49, 4.2 million viewers overall), ''Two and a Half Men'' (1.2/3 in 18-49, 5.0 million viewers overall), ''Mike and Molly'' (1.2/3 in 18-49, 4.7 million viewers overall) and ''Hawaii Five-0'' (1.1/3 in 18-49, 5.6 million viewers overall). Univision, which placed third on the night, led the broadcast nets in the 18-49 demo at 10 p.m. with ''La Que No Podia Amar'' (1.6/5 in 18-49, 4.4 million viewers overall). Leading off Monday, the premiere of ''Por Ella Soy Eva'' (For Her I'm Eva) drew a solid 1.3/4 in 18-49 and 3.4 million viewers overall. Preliminary 18-49 averages for the night: Fox, 2.6/8; ABC, 1.8/5; Univision, 1.5/4; NBC, 1.4/4; CBS, 1.1/3; CW, 0.3/1. In total viewers: Fox, 6.3 million; ABC, 5.6 million; CBS, 4.9 million; Univision, 3.9 million; NBC, 3.8 million; CW, 0.7 million.